protected void btnfileup_Click(object sender, EventArgs e)

   {

       try

       {

           if (FileUpload1.PostedFile.FileName == "")

           {

               Page.ClientScript.RegisterStartupScript(Page.GetType(), "message", "<script language='javascript' defer>alert('文件名称不能为空！');</script>");

               return;

           }

           else

           {

               FileUpload1.PostedFile.SaveAs(Server.MapPath("file/" + FileUpload1.PostedFile.FileName.Substring(FileUpload1.PostedFile.FileName.LastIndexOf("\\")+1)));

               Page.ClientScript.RegisterStartupScript(Page.GetType(), "message", "<script language='javascript' defer>alert('上传成功！');</script>");

           }

       }

       catch (Exception ex)

       {

           Response.Write(ex.Message.ToString());

           Page.ClientScript.RegisterStartupScript(Page.GetType(), "message", "<script language='javascript' defer>alert('上传失败！');</script>");

       }

   }